ML20003B783

LER 81-003/03L-0:on 810120,Model 288 Differential Pressure Indicating switch,3-1349B,tripped Above Tech Spec Limit. Caused by Instrument Drift.Switch Readjusted & Repeatability Verified

ML20003B783
Person / Time
Site:	Dresden
Issue date:	02/18/1981
From:	Magrow R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17193A740	List: ML17193A738 ML20003B783
References
LER-81-003-03L-01, LER-81-3-3L-1, NUDOCS 8102250513
Download: ML20003B783 (1)

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, LICENSEE EVENT REPORT r

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a ei oocxrT*uween avewf oars 74 atroarcare so EVENr DEsCMimCN ANo PRCOASLE CCNSECUENCES h ro TT1 l During normal operation while performing isolation condenser condensate line hi-flowl g g calibration, dPIS 3-13493 tripped at 34 inches water colu=n differential pressure. l g l Tech. Spec. Table 3.2.1 limit is less than or ecual to 32 inches of water i F5TT1 I column. Safety significance is minimal because redundant switch would have providedt i o is 1 l isolation within Tech. Spec limit. Similar events: 76-26/03L-0, 79-22/03L-0, f iaiyi I 79-58/03L-0. 80-11/03L-0 and 80-25/03L-0. I f7TT'1 l l U " #

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,,,3,l The cause for the setpoinC drift is unknown. The Barton Model 288 indicating switch, g ; was readjusted to trip at 29 inches water column differential pressure increasing I

,and repeatability was verified. DIS 1300- 2 will continue to be performed monthly l 4

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